有一条指令用十六进制表示为CD21，用二进制表示为()。
A. 1.10111e+015
B. 1.10011e+015
C. 1.10011e+015
D. 1.10111e+015
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Small particles mainly damage ______.
A. lungs
B. eyes
C. bloodstream
D. heart
A: Look at this pink watch. It looks great, doesn't it？ And it's only $ B: ______
A. It's only twenty dollars. Oh, my goodness.
B. I don't want to look at it. After all, it's a watch.
C. The price is good. But I want to buy a more expensive watch.
D. How is it possible that a watch only costs us $ 20？
Man: When are we supposed to submit our project proposals, Jane？ Woman: They're due by the
A. The deadline is drawing near.
B. She turned in the proposals today.
C. She can't meet the deadline.
D. They are two days ahead of time.
According to the most recent study, ______.
A. immigration only depresses unskilled natives' wages to a large extent
B. immigration puts a longer downward pressure on the natives' wages
C. immigrants' wages can rise to the level of natives' very quickly
D. immigrants tend to be in unemployment for a long time
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